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-rw-r--r--libc/sysdeps/linux/x86_64/syscall.S48
1 files changed, 48 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/x86_64/syscall.S b/libc/sysdeps/linux/x86_64/syscall.S
new file mode 100644
index 000000000..8795f9a69
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+++ b/libc/sysdeps/linux/x86_64/syscall.S
@@ -0,0 +1,48 @@
+/* Copyright (C) 2001, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+
+/* Please consult the file sysdeps/unix/sysv/linux/x86-64/sysdep.h for
+ more information about the value -4095 used below. */
+
+/* Usage: long syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6)
+ We need to do some arg shifting, the syscall_number will be in
+ rax. */
+
+
+.globl syscall;
+.type syscall,@function;
+.align 16;
+syscall:
+ movq %rdi, %rax /* Syscall number -> rax. */
+ movq %rsi, %rdi /* shift arg1 - arg5. */
+ movq %rdx, %rsi
+ movq %rcx, %rdx
+ movq %r8, %r10
+ movq %r9, %r8
+ movq 8(%rsp),%r9 /* arg6 is on the stack. */
+ syscall /* Do the system call. */
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae __syscall_error /* Branch forward if it failed. */
+ ret /* Return to caller. */
+
+__syscall_error:
+ /* TODO: implement this ! :D */
+
+.size syscall,.-syscall;